Floor acceleration analysis of multi-story and high-rise buildings based on a distributed parameter model

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (2) : 68-78.

FAN Yuan，LU Wensheng

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Abstract

More attention has been paid to the seismic performance and design of non-structural components of buildings. Among them, the study of floor acceleration demand can reasonably determine the seismic inputs of acceleration sensitive non-structural components. In this paper, the main structure is simplified by distributed parameter model, and the relationship between floor acceleration and seismic input and structural characteristics is established. The influence of flexural to shear stiffness ratio on structural dynamic characteristics and modal shape is studied. Based on the relationship between the frequency ratio of each order of modes and the stiffness ratio, a method for identifying the stiffness ratio of the structure is proposed. The far-field and near-field strong motion record data set from ATC-63 report is selected to predict the Floor Acceleration Amplification (FAA) factor. The relationship between floor acceleration amplification with structural damping ratio, period, stiffness ratio is regressed and fitted, and this relationship can be used to predict the floor acceleration.

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seismic demands of non-structural components / floor acceleration amplification factor / distributed parameter model / stiffness ratio / seismic design code

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FAN Yuan，LU Wensheng. Floor acceleration analysis of multi-story and high-rise buildings based on a distributed parameter model[J]. Journal of Vibration and Shock, 2023, 42(2): 68-78

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